Physician Profile
Unclaimed ProfileAbout SULLIVAN
Mark C Sullivan, PA-C is a physician assistant practising in Portsmouth, NH. Mark is also listed as specialising in physician assistant — surgical.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Common questions
What kind of doctor is Dr. Sullivan?
Dr. Sullivan is a physician assistant in Portsmouth, NH. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “PHYSICIAN ASSISTANT”.
NPI registry
What is Dr. Sullivan's address?
Dr. Sullivan is listed at 333 BORTHWICK AVENUE SUITE 402, Portsmouth, NH 03801. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Dr. Sullivan?
The number on file is (603) 559-4111. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Sullivan's NPI number?
Dr. Sullivan's National Provider Identifier is 1225075328. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Sullivan train?
Dr. Sullivan attended Other, graduating in 1992. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Sullivan been practising?
Dr. Sullivan has 34 years experience. Calculated from a graduation year of 1992, reported in the CMS National Downloadable File.
CMS public data
What procedures does Dr. Sullivan perform?
According to Medicare billing data, Dr. Sullivan the Medicare record under this individual NPI shows mainly office visits and diagnostic testing. Hospital-based physicians usually have their procedural work billed by the facility rather than under their own number, so this is a floor on their practice, not a description of it. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Sullivan confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Sullivan. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (603) 559-4111
- Email not available
Practice Locations
333 BORTHWICK AVENUE SUITE 402
Portsmouth, NH 03801
Procedures Most Often Billed to Medicare
40 services · 38 patients · 2 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | Office visit | 99232 |
29 |
| Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | Office visit | 99222 |
11 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other physician assistants at this location 2
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 3
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 23 related providers in 3 groups
Other physician assistants in Portsmouth 7
Same specialty, same city.
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
Class of 1992 at Other 8
Providers who graduated from the same medical school in the same year.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.